单选题To accomplish user-managed backup for the USERS tablespace, you issued the following command to put the database in backup mode: SQL ALTER TABLESPACE users BEGIN BACKUP; While copying the file to the backup destination a power outage caused the instance to terminate abnormally. Which statement is true about the next database startup and the USERS tablespace?（）AThe database will open, and the tablespace automatically comes out of the backup mode.BThe database will be mounted, and recovery must be performed on the USERS tablespace.CThe database will be mounted, and data files in the USERS tablespace must be taken out of the backup mode.DThe database will not be mounted, and you must restore all the data files for the USERS tablespace from the backup, and perform recovery.
单选题
To accomplish user-managed backup for the USERS tablespace, you issued the following command to put the database in backup mode: SQL> ALTER TABLESPACE users BEGIN BACKUP; While copying the file to the backup destination a power outage caused the instance to terminate abnormally. Which statement is true about the next database startup and the USERS tablespace?（）
A
The database will open, and the tablespace automatically comes out of the backup mode.
B
The database will be mounted, and recovery must be performed on the USERS tablespace.
C
The database will be mounted, and data files in the USERS tablespace must be taken out of the backup mode.
D
The database will not be mounted, and you must restore all the data files for the USERS tablespace from the backup, and perform recovery.
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多选题Your database is running in ARCHIVELOG mode. One of the data files, USERDATA01.dbf, in the USERS tablespace is damaged and you need to recover the file until the point of failure. The backup for the datafile is available. Which three files would be used in the user-managed recovery process performed by the database administrator （）(DBA)? (Choose Three)ARedo logsBControl fileCThe latest backup of only the damaged data fileDThe latest backup of all the data file in the USERS tablespaceETemporary files of temporary tablespaceFArchive Logs since the latest backup to point of failure
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